|Location||Chicago, Illinois, U.S.|
|Architectural||844 feet (257.3 m)|
|Floor area||835,624 sq ft (77,632.0 m2)|
|Design and construction|
|Architect||Lucien Lagrange Architects|
Park Tower is a skyscraper located at 800 North Michigan Avenue in Chicago, Illinois. Completed in 2000 and standing at 844 feet (257 m) tall with 70 floors — 67 floors for practical use, it is the twelfth-tallest building in Chicago, the 43rd-tallest building in the United States, and the 83rd-tallest in the world by architectural detail. It is one of the world's tallest buildings to be clad with architectural precast concrete (the Transamerica Pyramid Building in San Francisco is taller). It is one of the tallest non-steel framed structures in the world—it is a cast-in-place concrete framed structure. This building was originally intended to be 650 ft (200 m) tall. But later, the ceiling heights were increased allowing it to reach 844 ft (257 m).
The building occupies a footprint of 28,000 square feet (2,600 m2). Because of the small footprint and the fact that it is a non-steel-framed concrete building, this is the first building in the US to be designed with a tuned mass damper from the outset. While other skyscrapers in America have anti-sway systems, they were always added later. A tuned mass damper counteracts wind effects on the structure. (The 300-ton damper is a massive steel pendulum hung from four cables inside a square cage.) Because of its massive weight, the damper has inertia that helps stabilize the building from swaying in the wind.
Designed by Chicago architectural firm Lucien Lagrange Architects, Park Tower is a mixed-use tower. As the name suggests, the lower portion holds a Park Hyatt Hotel while the upper levels contain luxury condominiums.
The building contains 193,000 sq ft (17,900 m2) of hotel space (202 rooms), 475,000 sq ft (44,100 m2) of residential space, 20,000 sq ft (1,900 m2) of retail, and 92,000 sq ft (8,500 m2) of parking. Levels 9, 19, and the crown are mechanical areas. Floors 2 to 18 are hotel spaces, Floors 20 to 55 are residential apartments and Floors 56 to 70 are private condominiums. With its location on the prestigious Magnificent Mile, Park Tower is also home to the acclaimed restaurant NoMi.